body{
  margin: 0;
  padding: 0;
  font: 12px "微软雅黑",Arial,Helvetica,sans-serif;
}
*{
  margin: 0;
  padding: 0;
}
a{
  text-decoration: none;
}
header{
  cursor: pointer;
  height: 70px;
  line-height: 70px;
  background-color: rgba(30, 46, 62, 0.87);
  width: 100%;
  position: fixed;
  z-index: 1000;
  top: 0;
  nav{
    width: 1000px;
    margin: 0 auto;
  }
  .username{
    .fa{
      color:rgba(244, 156, 227, 0.87);
      font-size: 40px;
      vertical-align: middle;
      margin-right: 10px;
    }
    img{
      vertical-align: middle;
    }
  }

  ul{
    float: right;
    li{
      display: inline-block;
      margin: 0 15px;
      a{
        color: white;
        font-size: 18px;
      }
      a:hover{
        color:rgba(244, 182, 200, 0.87) ;
      }
    }
  }
}
.active{
  color: rgba(78, 197, 244, 0.87);
}